package cn.calin.day05.demo31StringBuilder;
/*
        java.lang.StringBuilder类：字符串缓冲区，可以提高字符串的效率
        构造方法:
            -public StringBuilder():构造一个空的StringBuilder
 */
public class Demo01StringBuilder {
    public static void main(String[] args) {
        StringBuilder bu1=new StringBuilder();
        System.out.println("bu1:"+bu1);//bu1:

        StringBuilder bu2=new StringBuilder("abc");
        System.out.println("bu2:"+bu2);//abc

    }
}
